Curl HTTP/2 RST_STREAM UAF during upload
CVE-2026-92392 Published on October 14, 2026

HTTP/2 upload Use-After-Free
During an upload, curl mishandles HTTP/2 `RST_STREAM` received from the server (with reason `HTTP_1_1_REQUIRED` or `REFUSED_STREAM`) leading to a use after free of a `struct Curl_easy` object.

NVD

Vulnerability Analysis

CVE-2026-92392 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-92392. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2026-92392 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2026-92392

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Haxx Curl
 
Canonical Ubuntu Linux
 

Affected Versions

curl: